CST 2301 Chapter 12.docx

Designing a URI

(Universal Resource Identifier) uniquely names a provider and its data, consisting of schema ("content://"), authority, and path to a table in the database.

UriMatcher

Matches incoming Uri with content provider's Uri, initialized with provider's name, path, and return code, used via uriMatcher.match(uri).

onCreate Method Implementation

Initializes the content provider on startup, e.g., creating an SQLite database.

Query Method Implementation

Retrieves data from the database based on the Uri, using SQLiteQueryBuilder and Cursor, and notifies observer objects about changes.

Insert Method Implementation

Inserts a new row into the database and notifies ContentResolver about the change.

Update Method Implementation

Updates one or more rows in the database and notifies ContentResolver about the change.

Delete Method Implementation

Deletes one or more rows from the database and notifies ContentResolver about the change.

getType Method Implementation

Specifies the content media type (MIME type), returning "vnd.android.cursor.dir" for multiple rows and "vnd.android.cursor.item" for a single row.

Content Provider Code Example

Complete code for the ContentProvider class, including Uri, database creation, and implementation of all six methods.

Content Provider Client Objective

The client app queries data stored in the content provider app's database and displays retrieved results on its screen.

Android Service

A component running tasks in the background without a UI, essential for multitasking apps like browsing and music playback simultaneously.